The baby fell asleep coughing a lot may be caused by allergic rhinitis, may also be cough variant asthma, gastroesophageal reflux, etc., should be promptly consulted to identify the cause. 1. Allergic rhinitis: allergic rhinitis is a chronic reactive inflammation of the nasal mucosa, the patient’s nasal secretion is more, usually a lot of watery nasal discharge, nasal congestion and other symptoms. When the baby falls asleep, affected by the change of body position, the nasal secretion can backflow into the throat, trachea, etc., and the formation of local stimulation, thus inducing or aggravating the symptoms of cough. 2. Cough variant asthma: cough variant asthma with chronic cough as the main or only clinical symptoms, manifested as irritating dry cough, and more intense, night cough for its important features. When cold, cold air, dust, etc. stimulate the airways, cough symptoms can be aggravated. 3. Gastroesophageal reflux: Due to the small capacity of the baby’s stomach, the position of the horizontal position, in the evening when lying down, the stomach food can reflux to the pharynx, thus appearing coughing badly. In addition to the above diseases, other factors can also lead to the symptoms of babies falling asleep and coughing, it is recommended to consult a doctor in time to identify the causes, and if necessary, under the guidance of the doctor for treatment.